I look at it as two completely different things; because really they are. The Edge had a lot more of a mean, vicious look to it as the Mercedes has a much smooth, classier look. The reason I switched was because my extended warranty was coming up, tires were on their way out... Figured if I was going to make a change the time was now.
The MPG difference is amazing. With the Benz I get 24 city/32 hwy. It has an i4 2.0 Liter engine but it also has an intercooled Turbo on their handcrafted engine which gives insanely surprising power.
With the Edge I filled up once a week, a full tank on the Benz lasts me easily 2 weeks (if I keep it in Eco mode and don't mess around in sport or manual mode)